I am trying to get some information on what enterprise hardware folks use out there. We are using Lucene extensively. Our total index size is roughly 50GB between roughly 8 various indexes, 2 of which take up 60-70% of this size.

So my question is - if any of you guys have similar index sizes then what kind of software/hardware do you have running, i.e. what app servers, how many, what hardware are these app servers running on?